{ "edges": [ { "to": "26226c89-7643-472c-9fea-b14e2370eb63", "from": "da46bbc9-f392-4c18-b2e8-2c84506854dd", "toPort": "0", "fromPort": "0" }, { "to": "a3932528-d56a-49c1-9242-c26cf539f43f", "from": "243a790d-0757-4814-83d0-4d3733dc15aa", "toPort": "0", "fromPort": "0" }, { "to": "2d334fb3-448f-4bcf-b6ee-5516c1aef5ae", "from": "26226c89-7643-472c-9fea-b14e2370eb63", "toPort": "0", "fromPort": "0" }, { "to": "da46bbc9-f392-4c18-b2e8-2c84506854dd", "from": "95194943-b7c5-4a0c-a2f5-a0a9ab3243b9", "toPort": "0", "fromPort": "0" }, { "to": "243a790d-0757-4814-83d0-4d3733dc15aa", "from": "7acd4df7-f43b-480c-a7a3-2ea497c6ad2e", "toPort": "0", "fromPort": "0" }, { "to": "a3932528-d56a-49c1-9242-c26cf539f43f", "from": "2eb6444f-ec80-4d99-9cda-16f3ffdb908b", "toPort": "0", "fromPort": "ai_languageModel" }, { "to": "a3932528-d56a-49c1-9242-c26cf539f43f", "from": "27d5f8e7-2af0-4df9-9420-0eca38b94e04", "toPort": "0", "fromPort": "ai_outputParser" }, { "to": "95194943-b7c5-4a0c-a2f5-a0a9ab3243b9", "from": "a3932528-d56a-49c1-9242-c26cf539f43f", "toPort": "0", "fromPort": "0" }, { "to": "14bf826a-9bba-410c-9482-2578ea26b949", "from": "0ed000fc-5884-4d56-a94c-c6bf2722c173", "toPort": "0", "fromPort": "0" }, { "to": "7acd4df7-f43b-480c-a7a3-2ea497c6ad2e", "from": "14bf826a-9bba-410c-9482-2578ea26b949", "toPort": "0", "fromPort": "0" } ], "nodes": [ { "id": "0ed000fc-5884-4d56-a94c-c6bf2722c173", "name": "Webhook - Upload Test Paper", "type": "trigger", "params": { "kind": "n8n-nodes-base.webhook", "path": "grade-assignment", "options": { "rawBody": true }, "responseMode": "responseNode" }, "position": [ -1872, -464 ] }, { "id": "14bf826a-9bba-410c-9482-2578ea26b949", "name": "Extract Text from Test Paper", "type": "passthrough", "params": { "mode": "noOp", "options": {}, "operation": "pdf" }, "position": [ -1648, -464 ] }, { "id": "7acd4df7-f43b-480c-a7a3-2ea497c6ad2e", "name": "Prepare Assignment Data", "type": "set", "params": { "options": {}, "assignments": { "assignments": [ { "id": "studentName", "name": "studentName", "type": "string", "value": "={{ $json.body.studentName || 'Unknown Student' }}" }, { "id": "assignmentTitle", "name": "assignmentTitle", "type": "string", "value": "={{ $json.body.assignmentTitle || 'Engineering Assignment' }}" }, { "id": "testPaperText", "name": "testPaperText", "type": "string", "value": "={{ $('Extract Text from Test Paper').item.json.data }}" } ] } }, "position": [ -1424, -464 ] }, { "id": "243a790d-0757-4814-83d0-4d3733dc15aa", "name": "Load Answer Script", "type": "set", "params": { "options": {}, "assignments": { "assignments": [ { "id": "answerScript", "name": "answerScript", "type": "string", "value": "=Question 1: Explain Ohm's Law and its applications (10 marks)\nAnswer: Ohm's Law states V=IR where V is voltage, I is current, R is resistance. Applications include circuit design, electrical troubleshooting, power calculations.\n\nQuestion 2: Describe the working principle of a DC motor (15 marks)\nAnswer: DC motor converts electrical energy to mechanical energy using electromagnetic induction. Current through armature creates magnetic field that interacts with stator field causing rotation.\n\nQuestion 3: Calculate stress in a beam under load (20 marks)\nAnswer: Stress = Force/Area. For bending stress: σ = My/I where M is moment, y is distance from neutral axis, I is moment of inertia.\n\nQuestion 4: Explain thermodynamic cycles (15 marks)\nAnswer: Common cycles include Carnot, Otto, Diesel, Rankine. Each involves heat addition, expansion, heat rejection, compression stages for energy conversion.\n\nQuestion 5: Discuss Boolean algebra and logic gates (10 marks)\nAnswer: Boolean algebra uses AND, OR, NOT operations. Logic gates implement these: AND gate outputs 1 only when all inputs are 1, OR gate outputs 1 when any input is 1." } ] } }, "position": [ -1200, -464 ] }, { "id": "a3932528-d56a-49c1-9242-c26cf539f43f", "name": "AI Agent - Grade Assignment", "type": "llm", "params": { "text": "=You are an expert engineering professor grading student assignments. \n\nANSWER SCRIPT (Correct Answers with Marks):\n{{ $json.answerScript }}\n\nSTUDENT SUBMISSION:\n{{ $json.testPaperText }}\n\nGrade this engineering assignment by:\n1. Comparing student answers against the answer script\n2. Award marks based on correctness, completeness, and technical accuracy\n3. Provide detailed feedback for each question\n4. Calculate total marks obtained\n\nProvide output in this JSON format:\n{\n \"questions\": [\n {\n \"questionNumber\": 1,\n \"maxMarks\": 10,\n \"marksObtained\": 8,\n \"feedback\": \"Good explanation of Ohm's Law but missing practical examples\"\n }\n ],\n \"totalMarks\": 70,\n \"totalObtained\": 55,\n \"percentage\": 78.57,\n \"grade\": \"B+\",\n \"overallFeedback\": \"Strong understanding of core concepts with room for improvement in practical applications\"\n}", "prompt": "=You are an expert engineering professor grading student assignments. \n\nANSWER SCRIPT (Correct Answers with Marks):\n{{ $json.answerScript }}\n\nSTUDENT SUBMISSION:\n{{ $json.testPaperText }}\n\nGrade this engineering assignment by:\n1. Comparing student answers against the answer script\n2. Award marks based on correctness, completeness, and technical accuracy\n3. Provide detailed feedback for each question\n4. Calculate total marks obtained\n\nProvide output in this JSON format:\n{\n \"questions\": [\n {\n \"questionNumber\": 1,\n \"maxMarks\": 10,\n \"marksObtained\": 8,\n \"feedback\": \"Good explanation of Ohm's Law but missing practical examples\"\n }\n ],\n \"totalMarks\": 70,\n \"totalObtained\": 55,\n \"percentage\": 78.57,\n \"grade\": \"B+\",\n \"overallFeedback\": \"Strong understanding of core concepts with room for improvement in practical applications\"\n}", "options": { "systemMessage": "You are a precise grading assistant. Always return valid JSON only." }, "provider": "openai", "promptType": "define", "approximated": true, "systemMessage": "You are a precise grading assistant. Always return valid JSON only.", "hasOutputParser": true }, "position": [ -976, -464 ] }, { "id": "27d5f8e7-2af0-4df9-9420-0eca38b94e04", "name": "Structured Output Parser", "type": "passthrough", "params": { "mode": "noOp" }, "position": [ -832, -240 ] }, { "id": "95194943-b7c5-4a0c-a2f5-a0a9ab3243b9", "name": "Generate Results Table", "type": "code", "params": { "jsCode": "const gradingResult = $input.first().json;\nconst studentName = $('Prepare Assignment Data').first().json.studentName;\nconst assignmentTitle = $('Prepare Assignment Data').first().json.assignmentTitle;\n\n// Create HTML table\nlet htmlTable = `\n

Grading Report: ${assignmentTitle}

Student: ${studentName}

\n\n \n \n \n \n \n \n \n \n \n`;\n\ngradingResult.questions.forEach(q => {\n htmlTable += `\n \n \n \n \n \n \n `;\n});\n\nhtmlTable += `\n \n \n \n \n \n \n \n \n \n

Question	Max Marks	Marks Obtained	Feedback
Question ${q.questionNumber}	${q.maxMarks}	${q.marksObtained}	${q.feedback}
TOTAL	${gradingResult.totalMarks}	${gradingResult.totalObtained}	Grade: ${gradingResult.grade} (${gradingResult.percentage.toFixed(2)}%)

Overall Feedback: ${gradingResult.overallFeedback}

\n`;\n\n// Create CSV data\nlet csvData = \"Question,Max Marks,Marks Obtained,Feedback\\n\";\ngradingResult.questions.forEach(q => {\n csvData += `\"Question ${q.questionNumber}\",${q.maxMarks},${q.marksObtained},\"${q.feedback.replace(/\"/g, '\"\"')}\"\\n`;\n});\ncsvData += `\"TOTAL\",${gradingResult.totalMarks},${gradingResult.totalObtained},\"Grade: ${gradingResult.grade} (${gradingResult.percentage.toFixed(2)}%)\"\\n`;\n\nreturn {\n studentName,\n assignmentTitle,\n htmlTable,\n csvData,\n gradingResult,\n summary: `${studentName} scored ${gradingResult.totalObtained}/${gradingResult.totalMarks} (${gradingResult.percentage.toFixed(2)}%) - Grade: ${gradingResult.grade}`\n};" }, "position": [ -624, -464 ] }, { "id": "26226c89-7643-472c-9fea-b14e2370eb63", "name": "Convert to CSV File", "type": "passthrough", "params": { "mode": "noOp", "options": {}, "binaryPropertyName": "=result-{{ $json.body.studentName || 'Unknown Student' }}" }, "position": [ -176, -464 ] }, { "id": "da46bbc9-f392-4c18-b2e8-2c84506854dd", "name": "Prepare CSV Data", "type": "set", "params": { "options": {}, "assignments": { "assignments": [ { "id": "data", "name": "data", "type": "string", "value": "={{ $('Generate Results Table').first().json.csvData }}" } ] } }, "position": [ -400, -464 ] }, { "id": "2eb6444f-ec80-4d99-9cda-16f3ffdb908b", "name": "Google Gemini Chat Model", "type": "llm", "params": { "options": {}, "provider": "google" }, "position": [ -976, -240 ] }, { "id": "2d334fb3-448f-4bcf-b6ee-5516c1aef5ae", "name": "Upload file", "type": "integration", "params": { "name": "=result-{{ $json.body.studentName || 'Unknown Student' }}", "driveId": { "__rl": true, "mode": "list", "value": "My Drive" }, "options": {}, "service": "googleDrive", "folderId": { "__rl": true, "mode": "list", "value": "root", "cachedResultName": "/ (Root folder)" }, "operation": "read", "inputDataFieldName": "result-{{ $json.body.studentName || 'Unknown Student' }}" }, "position": [ 48, -464 ] } ] }

Grade PDF assignments with Google Gemini and upload reports to Google Drive